/// <summary>
/// Add new object to drawing canvas.
/// Function is called when user left-clicks drawing canvas,
/// and one of ToolObject-derived tools is active.
/// </summary>
protected static void AddNewObject(DrawingCanvas drawingCanvas, GraphicsBase o)
{
HelperFunctions.UnselectAll(drawingCanvas);
o.IsSelected = true;
drawingCanvas.SelectedObject = o;
o.Clip = new RectangleGeometry(new Rect(0, 0, drawingCanvas.ActualWidth, drawingCanvas.ActualHeight));
drawingCanvas.GraphicsList.Add(o);
drawingCanvas.CaptureMouse();
}
/// <summary>
/// Handle mouse down.
/// Start moving, resizing or group selection.
/// </summary>
public override void OnMouseDown(DrawingCanvas drawingCanvas, MouseButtonEventArgs e)
{
commandChangeState = null;
wasMove = false;
Point point = e.GetPosition(drawingCanvas);
selectMode = SelectionMode.None;
GraphicsBase o;
GraphicsBase movedObject = null;
int handleNumber;
// Test for resizing (only if control is selected, cursor is on the handle)
for (int i = drawingCanvas.GraphicsList.Count - 1; i >= 0; i--)
{
o = drawingCanvas[i];
if ( o.IsSelected )
{
handleNumber = o.MakeHitTest(point);
if (handleNumber > 0)
{
selectMode = SelectionMode.Size;
// keep resized object in class member
resizedObject = o;
resizedObjectHandle = handleNumber;
// Since we want to resize only one object, unselect all other objects
HelperFunctions.UnselectAll(drawingCanvas);
o.IsSelected = true;
commandChangeState = new CommandChangeState(drawingCanvas);
break;
}
}
}
// Test for move (cursor is on the object)
if (selectMode == SelectionMode.None)
{
for (int i = drawingCanvas.GraphicsList.Count - 1; i >= 0; i--)
{
o = drawingCanvas[i];
if (o.MakeHitTest(point) == 0)
{
movedObject = o;
break;
}
}
if (movedObject != null)
{
selectMode = SelectionMode.Move;
// Unselect all if Ctrl is not pressed and clicked object is not selected yet
if (Keyboard.Modifiers != ModifierKeys.Control && ! movedObject.IsSelected)
{
HelperFunctions.UnselectAll(drawingCanvas);
}
// Select clicked object
movedObject.IsSelected = true;
drawingCanvas.SelectedObject = movedObject;
// Set move cursor
drawingCanvas.Cursor = Cursors.SizeAll;
commandChangeState = new CommandChangeState(drawingCanvas);
}
}
// Click on background
if (selectMode == SelectionMode.None)
{
// Unselect all if Ctrl is not pressed
if (Keyboard.Modifiers != ModifierKeys.Control)
{
HelperFunctions.UnselectAll(drawingCanvas);
}
// Group selection. Create selection rectangle.
GraphicsSelectionRectangle r = new GraphicsSelectionRectangle(
point.X, point.Y,
point.X + 1, point.Y + 1,
drawingCanvas.ActualScale);
r.Clip = new RectangleGeometry(new Rect(0, 0, drawingCanvas.ActualWidth, drawingCanvas.ActualHeight));
drawingCanvas.GraphicsList.Add(r);
selectMode = SelectionMode.GroupSelection;
}
lastPoint = point;
// Capture mouse until MouseUp event is received
drawingCanvas.CaptureMouse();
}